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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Auton+Neurosci
2017 ; 204
(ä): 35-47
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CNS sites activated by renal pelvic epithelial sodium channels (ENaCs) in
response to hypertonic saline in awake rats
#MMPMID27717709
Goodwill VS
; Terrill C
; Hopewood I
; Loewy AD
; Knuepfer MM
Auton Neurosci
2017[May]; 204
(ä): 35-47
PMID27717709
show ga
In some patients, renal nerve denervation has been reported to be an effective
treatment for essential hypertension. Considerable evidence suggests that
afferent renal nerves (ARN) and sodium balance play important roles in the
development and maintenance of high blood pressure. ARN are sensitive to sodium
concentrations in the renal pelvis. To better understand the role of ARN, we
infused isotonic or hypertonic NaCl (308 or 500mOsm) into the left renal pelvis
of conscious rats for two 2hours while recording arterial pressure and heart
rate. Subsequently, brain tissue was analyzed for immunohistochemical detection
of the protein Fos, a marker for neuronal activation. Fos-immunoreactive neurons
were identified in numerous sites in the forebrain and brainstem. These areas
included the nucleus tractus solitarius (NTS), the lateral parabrachial nucleus,
the paraventricular nucleus of the hypothalamus (PVH) and the supraoptic nucleus
(SON). The most effective stimulus was 500mOsm NaCl. Activation of these sites
was attenuated or prevented by administration of benzamil (1?M) or amiloride
(10?M) into the renal pelvis concomitantly with hypertonic saline. In
anesthetized rats, infusion of hypertonic saline but not isotonic saline into the
renal pelvis elevated ARN activity and this increase was attenuated by
simultaneous infusion of benzamil or amiloride. We propose that renal pelvic
epithelial sodium channels (ENaCs) play a role in activation of ARN and, via
central visceral afferent circuits, this system modulates fluid volume and
peripheral blood pressure. These pathways may contribute to the development of
hypertension.